User's Manual

PN 8100-40 Help Hot Line (U.S. only): 1-800-530-9960 7-31
620004-0 Rev. B
Link Budget Analysis
7.4 Link Budget Analysis
A link budget is a methodical way to account for the gains and losses in an RF system
so that the quality of coverage can be predicted. The end result can often be stated as
a “design goal” in which the coverage is determined by the maximum distance from
each RAU before the signal strength falls beneath that goal.
One key feature of the link budget is the maximum power per carrier discussed in
Section 7.1. While the maximum power per carrier is important as far as emissions
and signal quality requirements are concerned, it is critical that the maximum signal
into the Main Hub never exceed +21 dBm (126mW) minus system gain. Composite
power levels above this limit will cause damage to the Main Hub.
WARNING: Exceeding the maximum input power could cause perma-
nent damage to the Main Hub.
Table 7-27 LGCell Maximum Input Power
LGCell System Maximum Input Power
Simplex Ports (all LGCells) +21 dBm 126mW
Duplex Ports (Cellular) –9 dBm 126µW
Duplex Ports (iDEN, GSM,
EGSM, DCS, CDMA-Korea)
+21 dBm 126mW
Duplex Ports (1900 MHz PCS) –19 dBm 12.6µW